GH-235 Moved Kotlin support to a separate module

Resolves #235

spring-cloud-function-kotlin/src/test/java/org/springframework/cloud/function/kotlin/ContextFunctionCatalogAutoConfigurationKotlinTests.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.function.kotlin;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+import org.junit.After;
+import org.junit.Test;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.cloud.function.context.FunctionCatalog;
+import org.springframework.cloud.function.context.catalog.FunctionInspector;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import kotlin.jvm.functions.Function0;
+import kotlin.jvm.functions.Function1;
+import reactor.core.publisher.Flux;
+
+/**
+ * @author Oleg Zhurakousky
+ */
+public class ContextFunctionCatalogAutoConfigurationKotlinTests {
+
+	private ConfigurableApplicationContext context;
+	private FunctionCatalog catalog;
+	private FunctionInspector inspector;
+
+	@After
+	public void close() {
+		if (context != null) {
+			context.close();
+		}
+	}
+
+	@Test
+	public void kotlinLambdas() {
+		create(new Class[] {KotlinLambdasConfiguration.class, SimpleConfiguration.class});
+
+		assertThat(context.getBean("kotlinFunction")).isInstanceOf(Function.class);
+		assertThat(context.getBean("kotlinFunction")).isInstanceOf(Function1.class);
+		assertThat((Function<?, ?>) catalog.lookup(Function.class, "kotlinFunction"))
+				.isInstanceOf(Function.class);
+		assertThat(
+				inspector.getInputType(catalog.lookup(Function.class, "kotlinFunction")))
+						.isAssignableFrom(String.class);
+		assertThat(
+				inspector.getOutputType(catalog.lookup(Function.class, "kotlinFunction")))
+						.isAssignableFrom(String.class);
+
+		assertThat(context.getBean("kotlinConsumer")).isInstanceOf(Consumer.class);
+		assertThat(context.getBean("kotlinConsumer")).isInstanceOf(Function1.class);
+		assertThat((Function<?, ?>) catalog.lookup(Function.class, "kotlinConsumer"))
+				.isInstanceOf(Function.class);
+		assertThat(
+				inspector.getInputType(catalog.lookup(Function.class, "kotlinConsumer")))
+						.isAssignableFrom(String.class);
+
+		assertThat(context.getBean("kotlinSupplier")).isInstanceOf(Supplier.class);
+		assertThat(context.getBean("kotlinSupplier")).isInstanceOf(Function0.class);
+		Supplier<Flux<String>> supplier = catalog.lookup(Supplier.class,
+				"kotlinSupplier");
+		assertThat(supplier.get().blockFirst()).isEqualTo("Hello");
+		assertThat((Supplier<?>) catalog.lookup(Supplier.class, "kotlinSupplier"))
+				.isInstanceOf(Supplier.class);
+		assertThat(
+				inspector.getOutputType(catalog.lookup(Supplier.class, "kotlinSupplier")))
+						.isAssignableFrom(String.class);
+
+		Function<Flux<String>, Flux<String>> function = catalog.lookup(Function.class,
+				"kotlinFunction|function2");
+		assertThat(function.apply(Flux.just("Hello")).blockFirst())
+				.isEqualTo("HELLOfunction2");
+	}
+
+	private void create(Class<?>[] types, String... props) {
+		context = new SpringApplicationBuilder(types).properties(props).run();
+		catalog = context.getBean(FunctionCatalog.class);
+		inspector = context.getBean(FunctionInspector.class);
+	}
+
+	@EnableAutoConfiguration
+	@Configuration
+	protected static class SimpleConfiguration {
+
+		@Bean
+		public Function<String, String> function2() {
+			return value -> value + "function2";
+		}
+	}
+}

spring-cloud-function-kotlin/src/test/kotlin/org/springframework/cloud/function/kotlin/KotlinLambdasConfiguration.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.function.kotlin
+
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+
+/**
+ * @author Oleg Zhurakousky
+ *
+ */
+@EnableAutoConfiguration
+@Configuration
+open class KotlinLambdasConfiguration {
+    @Bean
+    open fun kotlinFunction(): (String) -> String {
+        return  { it.toUpperCase() }
+    }
+
+    @Bean
+    open fun kotlinConsumer(): (String) -> Unit {
+        return  { println(it) }
+    }
+
+    @Bean
+    open fun kotlinSupplier(): () -> String {
+        return  { "Hello" }
+    }
+}